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Do a search. There are a billion explanations already, no need for anyone to reexplain all the details. But basically you cover the spawn (bag contents/mycelium) between two layers of non-nutrative substrate like vermiculite or coco coir or a mix of the two which holds extra water for the flushes to use up (thus getting better flushes, than with high humidity alone). Also the casing helps protect against contamination by being non-nutrative, nothing for contams to eat so they won't grow there. And it maximizes your surface area so the flushes can be larger (when measured by square inches).